Periodical absorption refrigerating plant



July 16, 1940. '5. J. STEENSEN ,2

PERIODICAL ABSJORPTIQN REFRIGERATING PLANT Filed May 23, 19 39 In z/eng i eensen,

Patented July 16, 1940 UNITED STATES PATENT OFFICE Svcrre Johan Steensen, Ullevaal Haveby, near Oslo, Norway Application May 23, 1939, Serial No. 215,309 In Norway April 30, 1937 3 Claims. (0]. 62-5) This invention relates to periodically operated absorption refrigerating plants in which a magazine is arranged in connection with each evaporatorv between the latter and the appertaining condenser, said magazine being adapted to receive during the boilingperiod refrigerant from the condenser and to pass vapour out from the evaporator during the evaporation period.

- According to the invention apparatus is inserted between the magazine and'the cpndenser which receives condensate during the boiling period, and as soon as'the quantity of condensate has become sufilciently large, the apparatus will pass a small portion of condensate into the magazine, whereas the apparatus during, the evaporation period operates as a valve which under the control of the pressure causes vapour to pass out from the magazine and from the evaporator. The valve apparatus may be made as a piston arranged in. a cylinder with a small intermediate space and which carries a valve body for a valve through which condensate is passed into the magazine and vapour out from the magazine. Preferably the weight of the piston is approxirnately balanced by means of a spring, so that a valve needle attached to the piston is resting only with an easy tightening pressureupon its seat when the intermediate space between the piston and the cylinder is emptied of condensate,

' whereas thispressure is annulled by the buoyancy of thepiston when the condensate has risen up to a definite height in the intermediate space, whereby condensate during the boiling period is passed in small quantities down into the magazine proper.

The invention is illustrated in the drawing. Fig. 1 shows an embodiment in vertical section through the magazine, the valve apparatus and a portion of the wall of a refrigerating box Fig. 2 shows diagrammatically a complete plant,

Referring to the drawing there is shown in Fig. 2 a box I in whose interior an evaporator 2 is arranged. The evaporator is by pipes inconnection with one or two magazines I and the latter' are in turn connected through pipes 3 and condensers 4 each with a boiler-absorber K.

The valve apparatus is inserted between the magazine I and the appertaining pipe conduit 3 and is preferably made with an exterior cylinder ll which may be a separate aggregate as indicated in Fig. 2, or the valve apparatus may according to Fig. 1 be made with the cylinder II integral with the magazine 1. The latter has an outlet 6 for the refrigerant to the evaporator 2 and a return pipe for refrigerant vapour cause the needle l9 engages its seat 20.

back from the evaporator. The cylinder l3 may be enclosed in the insulation ii of the refrigerating box in order to obtain a compact construction, but it should preferably be arranged quite outside the insulation, so that it may be cooled by the air. The cylinder l3 has at the top a cover l4 provided with a conduit l5 from the condenser. Inside the cylinder l3 a float is movable up and down with a small intermediate space. The float may be made in the form of a piston IS with an interior bore I! wherein a spring I8 is arranged which balances completely the weight of the piston l6. To the piston I6 is attached a needle valve l9 which is pressed against a seat 20 by means of its own weight. Between the wall of the piston I6 and the cylinder l3 there is ari intermediate space 2| of about millimeter. A bore'23 with weights 22 serves for balancing the spring I8 and the piston I6.

The valve apparatus operates as follows:

At the commencement of a boiling period the magazine I is empty, and the same applies to' the apparatus and the conduit I5. As soon as the boiling commences, the vapour passes from the absorber through the condenser and the conduit I5 into the apparatus and stops there, be-

The pressure increases thereby in the space 2| until the condensation pressure is obtained. The vapour will'then be condensated in the condenser and pass through the conduit I5 into the space 2| between cylinder l3 and piston l6, so as to be collected therein. When the liquid level in space 2| has become sufliciently high, the buoyancy of the piston i6 is so large as to overcome the tightening pressure of needle IS on seat 20, and the piston i6 is then lifted. Thereby the valve opens and the condensate flows down into the magazine 1, whereupon the needle Ill-again moves down upon its seat 20, Into the magazine there has now arrived about three to five grams of condensate, This is repeated during the whole boiling period until all condensate, for instance 500 g., has passed into the magazine which is then filled.

After the boiling period the pressure in the condenser conduit ii of the absorber and in the valve apparatus sinks, whereupon the condensate in the evaporator with appertaining magazine I evaporates gradually and passes the same way back into the absorber, the vapours requiring only a small over-pressure in order to lift the valve needle I9. I

I claim:

1. Periodical absorption refrigerating plant,

comprising a boiler absorber, a magazine, a condenser, a connection between the magazine and the condenser, apparatus inserted between the magazine and the condenser and adapted to receive during the boiling period condensate and to pass, at any time the quantity of condensate has become sufllciently large, a small portion of the condensate into the magazine, and means whereby the apparatus during the evaporation period operates as a valve which under control of the pressure passes vapour out from the magazine or from the evaporator.

2. Arrangement according to claim 1, characterised in that the apparatus between the magaaine and the condenser is made as a piston which I is arranged in a-cylinder with a small intermediate space and carries a valve body for a valve through which condensate is passed into the magazine and vapour out from same.

3. Arrangement according to claim 1, characterised .in that the apparatus between the magazine and the condenser-is made as a piston which is arranged in a cylinder witha small intermediatespace and carries a valve body for a valve through which condensate is passed into the magazine and vapour out from same, the weight of the piston being nearly or completely balanced by means of a spring, so that a valve needle attached to the piston rests only with a small tightening pressure on its sea't'when the intermediate space between the pistonand the cylinder is emptied for condensate, whereas this pressure is'annulled by the buoyancy of the piston when the condensate has risen up to a definite height in this intermediate space, whereby the condensate during the boiling period is passed in small quantities down into the magazine proper.

SVERRE JOHAN STEENSEN. 

